C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 18/40 (2006.01) C08G 18/62 (2006.01) C09K 9/02 (2006.01) G03C 1/685 (2006.01) G03C 1/73 (2006.01)
Patent
CA 2281495
Described are photochromic polyurethane coatings that meet commercially acceptable "cosmetic" standards for optical coatings. Also described are articles having such coatings. The coatings exhibit a Fischer microhardness of from 50 to 150 Newtons per mm and improved photochromic properties, i.e., the formation of darker activated colors and faster rates of photochromic activation and fade when irradiated with ultraviolet light.
L'invention concerne des couches photochromiques de polyuréthanne conformes aux normes "cosmétiques" commercialement acceptables pour les couches optiques. Ces articles présentant de telles couches font aussi l'objet de cette invention. Ces couches font preuve d'une microdureté Fischer de 50 à 150 Newtons par mm et présentent des propriétés photochromiques améliorées, telles que la formation de couleurs activées plus foncées, ainsi que des taux plus rapides d'activation photochromique sous l'effet de rayonnements ultraviolets et de décoloration lorsque non soumises à ces rayonnements.
Bowles Robert J. III
Conklin Jeanine
Gruchacz Nancyanne
Hunt Robin
Swarup Shanti
Borden Ladner Gervais Llp
Ppg Industries Ohio Inc.
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